Abstract: Through thermogravimetric analysis and X-ray diffraction, the optimal calcination temperature and atmospheric conditions were identified. Results showed that 850 ℃ is the ideal temperature, achieving an SO₂ conversion rate of 76.8%, with favorable pore structure characteristics. The optimal atmosphere composition was 2000ppm SO₂, 15vol% CO₂, and 5vol% O₂. These findings provide a theoretical basis for desulfurization process optimization in circulating fluidized bed boilers.